Depressed Center Grinding Wheel Abrasive Material Zirconia Alumina Connector Size 7/8 in Connector Type Unthreaded Hole Grit 24 Overall Diameter 6 in Overall Thickness 0.25 in Primary Material Applicationn Aluminum Brass Bronze Cast Iron Composite Copper Masonry Plastic Stainless Steel Steel Compatible Tool Type Angle Grinder Series Z-Tech Z24R Wheel Type Type 27 Maximum Operating Speed 10 200 RPM Grade Extra Coarse